Drawing mechanism for spinning apparatus



July 2, 1940. P. LITTY 2,206,360

DRAWING HECHANISM FOR SPINNIN'G APPARATUS Filed May 14, 1958 PatentedJuly 2, 1940 PATENT OFFICE DRAWING MECHANISM FOR SPINNING APPARATUS PaulLitty, Iipzig, Germany Application 6 Claims.

The invention relates to a drawing-machine for spinning-frames,especially for the production of a testing thread for ascertaining thespinning capabilities of a fibrous material and the strength of a'thread spun from it. In this case, it is of special importance torapidly draw in succession a fibrous sliver from a short, a mediumsized, and a long flbre, without any adjusting of the nipper (gripping)and drawing rollers. The invention is adapted to be used in connectionwith the apparatus disclosed in my application Ser. No. 147,970, of June12, 1937.

In the known devices, a drawing-frame with adjustable drawing rollers isused for further working of the sliver produced with the small cardingengine. With such a drawing-frame, the correct distance between theindividual drawing rollers has to be ascertained in a rather troublesomemanner according to the respective length of flbre of the fibrousmaterial to be tested.

This not only delays ascertaining the spinning capabilities of thefibrous material and the strength of the thread spun from it, but thecost of the whole device is raised considerably, owing to thecomplicated construction of such a drawing-frame with adjustable drawingrollers.

As a fibrous material contains, apart from the principal length offlbre, also shorter fibres, the guiding of the libre in a nipperdrawingframe is not as good as in a drawing-machine.

The invention obviates these disadvantages inasmuch as for the furtherworking of a sliver, produced with a carding machine, for example withthe small carding engine disclosed in my application Ser. No. 147,970,of June 12, 1937, a drawing-machine is provided, in which are arrangedone or more little straps and which has heavily loaded pairs ofcylinders with fixed spacing at a distance considerably greater than thelongest fibres, and several loaded pressing rollers (preferably withrolling loads) of smaller diameter between the pairs of cylinders abovethe small strap or straps, or above a strap table substantially fillingthe space between the pairs of cylinders.

This invention is illustrated by way of example in the accompanyingdrawing, in which- Fig. l is a sectional view of the apparatus in therunning direction of the sliver of' fibrous material,

Fig. 2 is a top view of an individual part,

Fig. 3 is an elevational view of an individual part.

In the drawing, I2, 3 4, 5-6 are pairs of May 14, 1938, Serial No.208,028 Germany May 20, 1937 cylinders serving as nipper rollers, whichare loaded rather'heavily by means of the known hooks 1, 8, 9, providedwith weights I0, II, I2 of 5 and 15 kgs. As the drawing-machine servesfor drawing a single thread, this is a very heavy load. The cylinders I,3, and 5, are suitably fiuted rollers. The cylinders I and 3 at the sametime serve to guide the little straps I3, I4, which are conducted overstrap tables I5, I6 and which are kept under tension by loadedstretching rollers I1, I8.

The strap tables substantially extend along the Whole space between thepairs of nipper rollers. It is important to provide loaded pressing orcarrier rollers I9, 20, 2|, 22, 23, and 24 of smaller diameter on thestraps and above the strap tables, the pressure exerted by these rollersupon the fibrous sliver being increased by rollers 25 to 30 arrangedabove.

The carrier rollers are suitably of smaller diameter, as shown in thedrawing, arranged at very short distances at the side of each other sothat several drawing places are provided in the space between the pairsof nipper rollers. In this way, not only the long fibres, but also theshort fibres of a certain fibrous material are securely held, guided,and drawn, thus enabling fibres of for example fifteen to fortymillimeters length to be drawn at the same time in a favourable mannerand then to be spun. The front pair of rollers 24, 30 and 2l, 21respectively serves for holding the short fibres, the centre pair 23, 29and 20, 26 respectively for holding the fibres of medium length, and therear pair 2`2, 23 and I9, 25 respectively for holding the long libres,without having to lift any pair of' rollers. This results in the heavyload 'of the front pair of nipper rollers. I'he fibrous sliver is fed tothe drawing-machine through an inlet funnel 3l, and a condenser 32 isarranged between the drawing panels. This condenser has a conical slot33 which, in upward direction, leads into a suitaly oval opening 34growing narrower in the running direction of the sliver.

The weights 35, 36 of the stretching rollers I1 and I8 engage in cages31, 38 rotatable about axles 39, 40. These axles are parts of bows 4I,42, each of which is fixed to anadjusting plate 43, 44. These adjustingplates are oscillatable about pivots 45, 46. The plate 43 may be securedin an adjusted position by means of a thumb screw 49 having a threadedportion extending through a slot 41. The plate 44 is provided with asimilar slot 48 and a thumb screw 50.

With this device it is possible to adjust the little straps. whichsometimes get widened at both sides, to ensure that each strap runs flatover its table without sliding in a lateral direction. The inlet funnel3| is suitablyfixed to a rod I, and the condenser 32 is fixed to a rod52. The condenser I2 is loosely hung by means of a hook 5l having anopening for receiving a pin I4 on the rod 52. By means of any suitabledevice, the rod 5I is given a reciprocating movement and is connected byone or two bows 55 with the rod 52 to confer to the latter thereciprocating movement in the directions shown by arrows A and B in Fig.3.

'I'he apparatus provides two drawing zones, one between the rollers I. 2and 3, 4 and the other between the rollers 3, 4 and 5, i.

The rollers I and 2, the rollers Il, 20, 2i, 25, 26, 21 and the strap I3have a speed corresponding substantially to the circumferential speed ofthe roller I. 'I'his circumferential speed is ensured by the specialload of the lower rollers which is applied by means of the loadedrollers 25, 26 and 21. The same operation applies to the strap I4 andthe rollers cooperating therewith. The speed of the rollers 3 and 4however, is greater than the speed of the rollers I and 2 and preferablyabout one and one-half times greater. The speed of the rollers 5 and 6is greater than the speed of the rollers 3 and 4 according to the draftand from six to ten times greater than the speed of the rollers 3 and 4,or about eight to fifteen times greater than the speed of the rollers Iand 2.

The small rollers I9 to 30 are not positively driven but rotated as aresult of the frictional engagement with the straps I3 and I4.

What I claim is:

1. A drawing mechanism for spinning apparatus for producing a testingthread to ascertain the spinning capacity and thread strength qualitiesof a fibrous material comprising, at least two pairs of nipper rollersspaced with respect to each other and each pair of nipper rollers beingloaded with approximately 5 kilograms, said pairs of nipper rollersbeing arranged at a distance with respect to each other which is greaterthan the longest fibers to be worked, a further pair of nipper rollersloaded with approximately kilograms and spaced with respect to one pairof the first mentioned nipper rollers at a distance greater than thelongest fibers to be Worked, a fixed rest between the first mentionedpairs of nipper rollers, a strap movable over the fixed rest, a secondfixed rest between the second mentioned pair of nipper rollers and onepair of the first mentioned pairs of nipper rollers, a strap movableover the second fixed rest, several rollers each having a diametersmaller than that of the nipper rollers arranged above the straps, andan inlet funnel for collecting an incoming sliver of the fibrousmaterial.

2. A drawing mechanism for spinning apparatus for producing a testingthread to ascertain the spinning capacity and thread strength qualitiesof a fibrous material comprising, at least two pairs of nipper rollersspaced with respect to each other and each pair of nipper rollers beingloaded with approximately 5 kilograms, said pairs of nipper rollersbeing arranged at a distance with respect to each other which is greaterthan the longest fibers to be worked, a further pair of nipper rollersloaded with approximately 15 kilograms and spaced with respect to onepair of' the first mentioned nipper rollers at a distance greater thanthe longest fibers to be worked. a fixed rest between the firstmentioned pairs of' nipper rollers, a strap movable over the fixed rest,a second fixed rest between the second mentioned pair of nipper rollersand one pair of the first mentioned pairs of nipper rollers, a strapmovable over the second fixed rest, several guiding rollers each havinga diameter smaller than that of the nipper rollers arranged above thestraps, an inlet funnel for collecting an incoming sliver of the fibrousmaterial, and a weighted roller arranged above each guiding roller.

3. A drawing mechanism for spinning apparatus for producing a testingthread to ascertain the spinning capacity and thread strength qualitiesof a fibrous material comprising, at least two pairs of nipper rollersspaced with respect to each other and each pair of nipper rollers beingloaded with approximately 5 kilograms, said pairs of nipper rollersbeing arranged at a distance with respect to each other which is greaterthan the longest fibers to be worked, a further pair of nipper rollersloaded with approximately 15 kilograms and spaced with respect to onepair of the first mentioned nipper rollers at a distance greater thanthe longest fibers to be worked, a fixed rest between the firstmentioned pairs of nipper rollers, a strap movable over the fixed rest,a second fixed rest between the second mentioned pair of nipper rollersand one pair of the first mentioned pairs of nipper rollers, a strapmovable over the second fixed rest, several guiding rollers each havinga diameter smaller than that of the nipper rollers arranged above thestraps, an inlet funnel for collecting an incoming sliver of the fibrousmaterial, a weighted roller arranged abovey each guiding roller, and acondenser supported for limited movement between one of the pairs ofnipper rollers.

4. A drawing machine for spinning frames for the production of a testingthread comprising, pairs of nipper rollers arranged in a spaced relationwith respect to each other and at a distance greater than the longestfibers to be worked, unequal weights loading the pairs of' nipperrollers, a fixed rest between each of the pairs of nipper rollers,straps movable over the fixed rests, a roller for tensioning each strap,a cage for each tensioning roller, a bow member pivotally supportingeach cage of the tensioning roller, weights of different size loadingthe cages ofthe tensioning rollers, guiding rollers each having asmaller diameter than that of the nipper rollers, a loaded roller aboveeach of the guiding rollers, an inlet funnel for collecting an incomingsliver of fibrous material, and a condenser loosely suspended adjacent apair of the nipper rollers.

5. A drawing machine for spinning frames for the production of a testingthread comprising, pairs of nipper rollers arranged in a spaced relationwith respect to'each other and at a distance greater than the longestfibers to be worked, unequal weights loading the pairs of nipperrollers, a fixed rest between each of the-pairs of' nipper rollers,straps movable over the fixed rests, a roller for tensioning each strap,a cage for each tensioning roller, a bow member pivotally supportingeach cage of the tensioning roller, weights of different size loadingthe cages of the tensioning rollers, carrier rollers each having asmaller diameter than that of the nipper rollers, a loaded roller aboveeach of the carrier rollers, an inlet funnel for collecting an incomingsliver of fibrous material, a condenser loosely suspended adjacent apair of the nipper rollers, a rod for supporting 745'" the condenser anda rod supporting the funnel,

and means connecting said rods.

ferent size loading the cages 'of the tensioning rollers, carrierrollers each having a smaller diameter than that of the nipper rollers,a loaded roller above each of the carrier rollers, an inletI funnel forcollecting an incoming sliver of brous material, a condenser looselysuspended adjacent a pair of the nipper rollers, a rod supporting thecondenser and a rod supporting the funnel, means connecting said rodsand said condenser having a conical slot in the lower end thereof endingin an 10 oval shaped opening.

PAUL LITTY.

